/Engine/Source/Developer/Datasmith/DatasmithExporter/Public/DatasmithSceneExporter.h
Exports the entire scene. It will create the scene file as well as the resized textures (in case of resize is enabled).
void Export ( [TSharedRef](API\Runtime\Core\Templates\TSharedRef)< [IDatasmithScene](API\Runtime\DatasmithCore\IDatasmithScene) > DatasmithScene, bool bCleanupUnusedElements )